Tony Blair enjoyed a bumper year with profits tripling at one of his firms, latest accounts reveal.

Revenues rose from £12million to £16million at Windrush Ventures, part of the former Prime Minister’s complex web of businesses.

Profits soared from £1.1million in 2011 to £3.6million, the accounts show.

However, this is likely to be just the tip of the iceberg, as the figures cover only one part of Mr Blair’s vast business empire, most if which is shrouded in secrecy.

He uses an elaborate structure of companies and partnerships for his worldwide operations, but does not disclose his earnings from either his foreign government advisory service or his business consultancy, Tony Blair Associates.

Last year, it was revealed in an interview with the Financial Times that Mr Blair’s work pulled in more than £20million from advising business chiefs and foreign governments.

He can command up to £350,000 for delivering a speech, and earns £2.5million a year advising U.S. investment bank JP Morgan.

The size of the former Labour leader’s income is certain to provoke fresh criticism of his money-making exploits since he left office, even though he insists he pays full UK income tax on all his earnings.

Among Mr Blair’s clients is the government of Kazakhstan, where his team are advising on ‘green growth’ and regulatory reform.

The £8million-a-year consultancy deal with dictator Nursultan Nazarbayev has been criticised by opposition groups in the country. Respublika, an opposition newspaper, has been ordered to close by the country’s notorious president after it accused Mr Blair of ‘whitewashing’ the president’s image and human-rights record.

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After a crackdown a year ago, when police killed 15 protesters, Respublika ran the headline ‘Blood on your hands, Blair’, and called on him to quit.

Mr Blair has also advised the government of Kuwait on good governance. He helped to produce a report, Kuwait Vision 2035, outlining the main issues facing the country.

Among Mr Blair's clients is the government of Kazakhstan. The £8million-a-year deal with dictator Nursultan Nazarbayev (pictured) has been criticised by opposition groups in the country

Windrush Ventures, which provides management services for Mr Blair’s government advisory service, has a staff of 29, and operating costs of £12.6million.

Catherine Rimmer, a former No10 aide, says in the directors’ report that the Windrush group has merely ‘traded satisfactorily’.

Mr Blair, whose riches have enabled his family to buy a string of properties, says the Windrush profit ‘is being held in the company for reinvestment in expanding the business’.

His spokesman added: ‘There is a total of £909,000 payable in corporation tax on the group profit.’ Since leaving Downing Street in 2007, Mr Blair has combined his charity work and his diplomatic role as a Middle East envoy with lucrative work in the private sector and for foreign governments.

His commercial consultancy, Tony Blair Associates, is concentrated in another group of companies called Firerush - a mirror image of the Windrush structure. This publishes only limited accounts which show a £68,000 surplus on running costs on which corporation tax has been paid.

The Office of Tony Blair (tonyblairoffice.org) website states that the accounts show the operating costs of Blair’s global activities and says they ‘do not represent his earnings or the earnings of his business’.

It adds: ‘Mr Blair continues to be a UK taxpayer and pays full personal tax on all his earnings worldwide.’